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Light gray youth t-shirt with ten sea lion profiles in white, gray, tan and brown. Text "The Marine Mammal Center" "Sausalito California" underneath design.

Youth Decade T-Shirt

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Our one-of-a-kind Decade Design, initially created in honor of The Marine Mammal Center’s 10th anniversary, remains our most popular design over 30 years later. Featuring the side profiles of ten regal sea lions, this classic is sure to draw compliments.


 Size Sleeve Length (inches) Bust/Chest Length (inches) Front Length (inches)
XS 5.5" 13" 18"
S 6" 15" 20"
M 6" 16" 26"
L 7" 18" 26"



  • 90% cotton, 10% polyester.
  • Youth sizes: XS-L.